By the time the First Emperor came to power, he had built on the achievements of six generations of predecessors, wielded his mighty whip to rule all under heaven, swallowed up the two Zhou states and destroyed the feudal lords, ascended to the highest throne and brought the whole world under his control. He wielded the rod and whip to scourge the realm, his might reaching the four seas. In the south, he seized the lands of the Baiyue and established the commanderies of Guilin and Xiang. The Baiyue rulers bowed their heads and submitted themselves to his officials. He then ordered Meng Tian to build the Great Wall in the north and guard the frontier, driving the Xiongnu back more than seven hundred li. The barbarians dared not ride south to pasture their horses, and the scholars dared not bend their bows to seek revenge. He abolished the ways of the former kings and burned the writings of the hundred schools, so as to keep the common people ignorant. He razed famous cities and killed outstanding men; gathered the weapons of the realm in Xianyang, melted down their blades and arrowheads, and cast them into twelve bronze statues, weakening the people of the land. Then he made Mount Hua his wall and the Yellow River his moat, relying on walls a hundred million feet high and facing an unfathomable abyss to make his defenses secure. Strong crossbows and capable generals guarded the strategic passes, while trusted ministers and elite soldiers stood with sharp weapons, ready to challenge any intruder.